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01-02-2024
Medicine

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In regards to screening tests for pre-op evaluation of bleeding times, which statement is incorrect?
A. PT (prothrombin time) is activated by tissue thromboplastin, tests extrinsic and common pathways, with a normal time of 11-15 seconds
B. PT measures factors II, III, V, VII, and X
C. APTT
(activated partial thromboplastin time) tests intrinsic and common pathways, with a normal reading of 25-35 seconds
D. INR (International normalized ratio) has normal range of .8-1.2 and is calculated by the ratio of the patients PT/normal PT raised to the power of the ISI (International sensitivity index)

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